Ch 9: Perceiving color Flashcards
selective reflection
certain things reflect certain wavelengths of light
selective reflection
only some wavelengths of light pass through certain transparent objects
color contrast
green looks greener on a red background because of the contrast
color assimilation
colors blend together locally
3 basic dimensions of color experience
-hue
-saturation
-brightness (value)
hue
qualitative and determined by wavelength
saturation
-captivates purity and vividness
-determined by how much white is there
brightness/value
-light intensity
-white has most, black has least
trichromatic theory
theory that explains how we perceive color by using three types of cones in our eyes that are sensitive to red, green, and blue
opponent process theory
-color vision is caused by opposing psychological responses generated by three mechanisms
-blue and yellow, red and green, black and white
-cannot see blueish yellows or greenish red
Maxwell’s color matching procedure
-experimenter shows a wavelength of light and subject has to match the reference color by using red, blue, and green
-ppl w color deficiencies only need two wavelengths to match the color
monochromatism
-hereditary colorblindness
-no functioning cones
-vision limited to dim and bright lights
Dichromatism
-missing one of three cone pigments
-cannot detect as many colors as trichromats
-Passed down through X chromosome
-diagnosed used Ishihara plates
Anomalous trichromatism
mixes wavelengths in different proportions relative to a trichromat
cerebral achromatopsia
-loss of ability to perceive color due to cortical damage
-total color blindness
-difficulty distinguishing objects from each other and their backgrounds
